The alarm clock went off with a blood-curdling scream -- the scream of a woman in mortal terror! It sent shivers down Jupiter's spine.
Who could have made such a horrid clock -- and why?
That's what The Three Investigators set out to discover. Their search leads them to a mysterious old, run-down house in Hollywood. There they find a whole room full of the dreadful clocks -- and mystery turns into danger!